[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.430382] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.870539] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.379301] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.069266] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 27.241426] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 32.859746] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 32.957765] BUG: unable to handle kernel paging request at ffffeafff8dc0008 [ 32.965106] IP: [] page_remove_rmap+0x2e/0x260 [ 32.971608] PGD 0 [ 32.973846] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.978797] Dumping ftrace buffer: [ 32.982321] (ftrace buffer empty) [ 32.986006] Modules linked in: [ 32.989287] CPU: 0 PID: 3807 Comm: syz-executor396 Not tainted 4.4.148-gf057ff9 #81 [ 32.997059] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.006391] task: ffff8801ca108000 task.stack: ffff8801d9518000 [ 33.012420] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.021095] RSP: 0018:ffff8801d951f9c0 EFLAGS: 00010246 [ 33.026515] RAX: dffffc0000000000 RBX: ffffeafff8dc0000 RCX: ffffea0002dc0000 [ 33.033956] RDX: 1ffffd5fff1b8001 RSI: ffffffff814bc75f RDI: ffffeafff8dc0008 [ 33.041481] RBP: ffff8801d951f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.048733] R10: 0000000000000001 R11: ffff8801ca108000 R12: 0000000000000001 [ 33.056146] R13: 1ffff1003b2a3f3e R14: ffff8801cf323800 R15: ffffeafff8dc0000 [ 33.063523] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.071836] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.077803] CR2: ffffeafff8dc0008 CR3: 00000001cf30c000 CR4: 00000000001606f0 [ 33.085243] Stack: [ 33.087377] ffff8801d951fc50 0000000000000001 ffff8801d951fa78 ffffffff8150a1f3 [ 33.095652] 00003ffe370001e0 00003ffe370001e0 0000000041b58ab3 ffffffff841ef82f [ 33.103788] ffffffff81509ff0 00000000000004f0 ffff8801cf15ad10 ffff8801d951fa40 [ 33.111784] Call Trace: [ 33.114351] [] zap_huge_pmd+0x203/0x510 [ 33.119951] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.126506] [] unmap_single_vma+0xea3/0x1240 [ 33.132549] [] ? vm_normal_page+0x230/0x230 [ 33.138510] [] ? __put_single_page+0x60/0x60 [ 33.144546] [] unmap_vmas+0x81/0xd0 [ 33.149800] [] exit_mmap+0x1c9/0x3a0 [ 33.155143] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.161610] [] ? up_write+0x1a/0x60 [ 33.166876] [] mmput+0xf8/0x2d0 [ 33.171778] [] do_exit+0x8d8/0x26b0 [ 33.177029] [] ? file_map_prot_check+0x193/0x310 [ 33.183495] [] ? release_task.part.17+0x1200/0x1200 [ 33.190176] [] ? SyS_mprotect+0x41e/0x640 [ 33.195951] [] ? up_write+0x1a/0x60 [ 33.201202] [] ? SyS_mprotect+0x423/0x640 [ 33.206973] [] do_group_exit+0x111/0x330 [ 33.212671] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.219141] [] SyS_exit_group+0x1d/0x20 [ 33.224748] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.231302] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 33.258502] RIP [] page_remove_rmap+0x2e/0x260 [ 33.264827] RSP [ 33.268427] CR2: ffffeafff8dc0008 [ 33.271857] ---[ end trace 23786bdcd8c91d9e ]--- [ 33.276597] Kernel panic - not syncing: Fatal exception [ 33.282189] Dumping ftrace buffer: [ 33.285772] (ftrace buffer empty) [ 33.289466] Kernel Offset: disabled [ 33.293086] Rebooting in 86400 seconds..